Sound-regulator for autopneumatic musical instruments.



PATENTED DEC. 13

0. GELN'AY.

SOUND REGULATOR FOR AUTOPNEUMATIC MUSICAL INSTRUMENTS.

APPLICATION FILED APR. 5. 1904.

N0 MODEL UNITED STATES Patented December 13, 1904.

CHARLES GELNAY, OF NEWV YORK, N. Y.

SOUND-REGULATOR FOR AUTOPNEUMATIC MUSICAL INSTRUMENTS.

SPECIFICATION forming part of Letters Patent No. 777,505, dated December13, 1904.

Original application filed February 26, 1904, Serial No. 195,347.Divided and this application filed April 5, 1904. Serial No.

To all whom it may concern:

Be it known that I, CHARLES GELNAY, a citizen of Austria-Hungary,residing at New York city, (Manhattan) county and State of New York,have invented new and useful Improvements in Sound -Regulators forAutopneumatic Musical Instruments, (which is a division of applicationfiled February 26, 1904, under Serial No. 195,347,) of which thefollowing is a specification.

This invention relates to improved means for regulating the volume ofsound of an autopneumatic musical instrument so that the rendering ofthe music may be varied to conform to the taste of the player or to therequirements of the particular piece of music played.

In the accompanying drawings, Figure 1 is a longitudinal section, partlyin elevation, of my improved sound regulating mechanism; and Fig. 2 is across-section on line 2 2, Fig. 1.

The letter 6 represents the exhaust-bellows of an autopneumatic musicalinstrument, the lower board I) of which is vibrated from crank-shaft Z2by connecting-rod b. The upper board Z2 of bellows b is provided with aninlet-port 5", having valve 6, and with an outlet-port 6 having valve 6The outlet-valve b discharges the exhausted air into the atmosphere andis guarded by an open cover 6. Above the inlet-port b there is mountedupon the board 6* a cell 0, which at c communicates with a pipe cl,connected to the vacuumchest 6, in which suction is to be produced. Thechest 6 is operatively connected by flexible tubes (not shown) with theusual key-actuating mechanism. Upon the cell c is mounted a bellows f,which communicates at f with cell 0 and constitutes a receiver. Thebellows f are normally distended by a spring f and communicate by a portf with a valve-box n, having an inlet-opening n. This opening iscontrolled by clack-valve 0, having outwardlyprojecting screw-stem 0.This (No model.)

p shaft 9. This shaft is by flexible shaft 9* connected to a shaft whung in bearings T The shaft r is in turn connected by flexible shaft rwith the spindle s of ahand-wheels. The spindle s rotates in bearings Zof a tubular guide Z, which is supported in the frame (1/ of theinstrument. By turning hand-wheel s in one direction the coupling P willbe lowered upon stem 0 to compress spring g. In this way the tension ofvalve 0 is increased to check the ingress of the air. If the hand-wheels is turned in the opposite direction, the spring (1 will be relieved totake the tension more or less ofi valve 0 and correspondingly facilitatethe ingress of air.

In use the suction-bellows b will upon expanding exhaust the air fromchest 6 through pipe cl, port 0', cell 0, and port If. During thismovement a suction will be created in receiver f, which will thus bepartly collapsed. This suction will tend to open valve 0 against actionof spring q to admit a small quantity of air into the receiver. Thus byadjusting the tension of valve 0 the quantity of air sucked in may beregulated to correspondingly regulate the vacuum in receiver f and theforce of suction in chest a. In this way the suction operating upon thekeys is regulated to correspondingly regulate the force of thekey-stroke and the volume of sound emitted by the instrument. If thebellows b is collapsed, the air is exhausted through port 6 What I claimis 1. In an autopneumatic musical instrument, the combination of bellowswith a receiver, an air-inlet valve having a threaded stem, a rotatablecoupling having a nut engaging such stern, and with a spring engagingthe coupthe shaft, andaspring engaging the coupling,

ling, substantially as specified. substantially as specified. IO

2. In an autopneuinatic musical instrument, I Signed by me at New Yorkcity, (Manhatthe combination of bellows with a receiver, an tan), NewYork, this 4th day of April, 1904. 5 air-inlet valve having a threadedstem, a ro- CHARLES GELNAY.

tatable coupling having a nut and a squared WVitnesses: opening, asquared shaft that slidably en- \VILLIAM SCHULZ,

gages the said opening, means for rotating FRANK v. BRIESEN.

